Effects of arbuscular mycorrhizal fungi on growth and nutrient characteristics of Cinnamomum bodinieri seedlings
[Objective]In this study,the effects of arbuscular mycorrhizal fungi(AM fungi)and their different species on the growth and nutrient characteristics of Cinnamomum bodinieri seedlings were investigated to provide a reference for the mycorrhizal seedling technology of C.bodinieri.[Method]Taking current year seedlings of C.bodinieri as the research object,four kinds of treatments were designed to conduct potting experiments:single inoculated with Rhizophagus intraradices(Ri),single inoculated with Funneliformis mosseae(Fm),mixed inoculated with two strains(Ri-Fm)and no inoculation control(CK).The growth and nutrient indexes of nitrogen,phosphorus and potassium in the roots,stems and leaves of C.bodinieri were determined,and the comprehensive evaluation was conducted by principal component analysis.[Result]The infection rates of the three inoculation treatments on the roots of C.bodinieri were 19.62%-28.15%,and the infection rate of single inoculation with Ri was the highest.About 4 months after inoculation,AM fungi began to promote significantly the aboveground growth of C.bodinieri.When the seedlings were harvested after 8 months,the results showed that all three inoculation treatments promoted significantly the root growth of C.bodinieri and increased the number of roots,among which the single inoculation of Fm had the most significant promotion effect.The inoculation treatments also increased significantly the biomass of C.bodinieri,and the plant biomass of single-inoculation Ri,single-inoculation Fm and co-inoculation treatments was 3.11,3.18 and 2.85 times higher than those of the CK treatment,respectively.In terms of nutrient characteristics,AM fungi significantly increased the P content and decreased the N and K content of each organ of C.bodinieri seedlings;it also increased the accumulation of N,P,and K;the utilization efficiency of N and K element,and decreased the utilization efficiency of P element.The results of principal component analysis were ranked as Fm>Ri>Ri-Fm>CK.[Conclusion]Both single and mixed inoculation of F.mosseae and R.intraradices can promote the growth of C.bodinieri seedlings and the accumulation of nitrogen,phosphorus and potassium to different degrees,and improved the utilization efficiency of nitrogen and potassium.The promoting effect of single inoculation with F.mosseae was the largest,which can be considered to be applied to industrial seedling.
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